- knife [nīf]n.pl. knives [ME knif < OE cnif, akin to Ger kneif, ON knīfr < IE * gneibh- (> Lith gnaibis, a pinching): for base see KNEAD]1. a cutting or stabbing instrument with a sharp blade, single-edged or double-edged, set in a handle2. a cutting blade, as in a machinevt.knifed, knifing1. to cut or stab with a knife☆ 2. Informal to use underhanded methods in order to hurt, defeat, or betrayvi.☆ to pass into or through something quickly, like a sharp knife——————☆ under the knifeInformal undergoing surgeryknifelikeadj.
English World dictionary. V. Neufeldt. 2014.